Automatic relief-valve for pneumatic tires.



S. P. NOE. AUTOMATIC RELIEF VALVE FOR PNEUMATIC TIRES.

APPLICATION FILED MAR. 6, 1912.

Patented June 10, 1913.

Egg 3 INVENTOR ,Jjeawnan Pi 12 00 SEAMAN P. NOE OCEAN GROVE, NEW JERSEY.

AUTOMATIC RELIEF-VALVE FOR PNEUMATIC TIRES.

Specification of Letters Patent. 1 Pate ted n ne 1 0, 1 91 3.

Application filed March 6, 1912. Serial No. 681,999.

full capacity or to the expansion of the airincident to heat, frequentlycauses what is known as a blow out sometimes rendering the tireabsolutely useless or requiring considerable expense to repair the same.

One of the objects of the present invention is to provide a safety valvefor the inflation of pneumatic tires embodying among othercharacteristics means whereby in the event of excessive pressure withinthe tire incident to an over quantity offluid or by virtue of expansionof heated gases therein, the excessive pressure. in the tire will berelieved automatically to avoid or prevent blow outs frequentlyhappening to inflated tires.

lVit-h the above and other objects in view the present inventionconsists in the combination and arrangement of parts hereinafter morefully described, illustrated in the accompanying drawings andparticularly pointed out in the appended claim, it being understood thatchanges maybe made in the form, proportion, size and minor detailswithout departingfrom the spirit or sacrificing any of the advantages ofthe invention.

In the drawings :F igure 1 is a sectional view through a portion of apneumatic tire illustrating my invention in elevation, the

co-nncotiOns with the tire being shown in section. Fig. 2 is an enlargeddetail sectional view of my improved automatic valve.

Referring now more particularly to the accompanying drawings, thereference charactor 10 Indicates an Inner tube of any ordinary type forpneumatic tires which is inclosed in'a casingll of any suitable type andwhich is held in operative condition by means of a clencher or othersuitable rim 12 provided with an opening 13 through which and alsothrough the inner side of the casing 11 extends a nipple 14 which issecured in any suitable manner, as-for instance, by a head 15 to theinner tube 10, the outer end of the nipple 14 being screw threaded asshown. Secured to thescrew threaded outer end of the nipple 14:"isanother nipple 15,

preferably, although not necessarily tapered exteriorly as shown, and atits inner" side provided with a screw threaded socket which hascommunication with the-bore 16 of the aforesaidmipple 14 and in thebottom of which socket there is preferably disposed packing material 17on which rests the reuced annular edge 18 of the outer end of a valvecasing whose outer end is screw threaded into the screw threaded socketof the nipple 15, as shown.

Formed with or-secured in the outer end I of the casing 19 is a valveseat 20 provided with a bore 21 which alines with the aforesaid bore 16of the nipple 14. The bore 21 of the valve seat 20 is preferablyslightly tapered interiorly as indicated at 22 and has the exterior ofits inner end preferably cut away to provide an annular space 23.

Formedin the side walls of the aforesaid valve casing 19 are oppositelydisposed perforations 24. By virtue of the cut away portion of the valveseat and the tapered interior thereof the valve seat is provided with 30adapted to provide a wrenching means for engagement with the stem 31 ofthe adjusting nut'32 which is mounted in the outer end of thehollow-stem 28 to adjust the check valve 33 against the action of thehelical or 'air from the inner tube.

The inner side of the valve 27 1S preferably concave to receive one endof the helical of other spring whose opposite end is fitted preferablyin a concaved face of an adjusting nut 36 having screwthreaded'engagement in the outer end of the casing -19 and whichnut 19may be manipulated to adjust the tension of the spring 35 in anysuitable manner. 'The adjusting nut 36 is preferably provided withsockets 37 to receive any suitable wrench to facilitate screwing andunscrewing of the same.

There may be twoor more apertures 24 in the-side walls of the casing 19,and for that matter, a single perforation may be employed to perform thefunction of .a plurality of apertures. In any event, the apertures 24are preferably disposed toward the outer end of the casing 19 slightlybeyond the inner edge ofthe valve seat 20 so that if any dust or dirtshould find its way through the apertures it would lodge in the space 23between the valve seat 20 and the casing 19 and thereby be preventedfrom entering. the tire. Another reason for having the apertures 24disposed as explained with relation to the valve seat is to have thevalve 27 always in a position inwardly toward the inner end of thecasing 19 beyond the apertures 24 so that upon the slightest movement ofthe valve 27 from its valve seat 20 the excessive air would immediatelyleave the casing 19. The excessive air is not permitted to go to theinner end of the casing 19 on the inner side of the valve 27 and therebypossibly cause an equalized or back pressure. The excessive air ispreferably confined,

, while in the casing 19, between the outer end of the casing and theouter side of the valve 27 with the latter always disposed slightlyinwardly beyond the apertures 24. The result is that in the event ofexcessive pressure which cannot find its way out through thehollow-valve stem 28, because of the check valve 33, the valve 27 willbe lifted from its seat against the tension of the spring 35 and theexcessive air is forced by the outer face of the valve 27 down into theinterspace 23 between the casing 19 and the valve seat 20 and thencelaterally outward through the apertures 24 in the casing 19 to theatmosphere. Thus the excessive air has very little space to occupy inthe casing 19 because the slightest movement of the valve 27 from itsseat effects an immediate discharge of the excessive air.

It is common in inflation of pneumatic tubes to use a testing device atcertain periods of-the inflation in order to determine whether thepredetermined quantity of air has been pumped into the tire. Thisrequires unfastening the pump connection with the tire'and is moreorless laborious and unsatisfactory- In the use of the present valve,which may be readily secured to any pneumatic tube, the moment that thepredetermined pressure in the tire has been reached there is animmediate Warning caused by the noise resulting from the expelling ofthe excessive pressure through the apertures 24. After the tire has beenblown up to its full capacity there is always danger of the air becomingheated and consequently expanding, in which event, the tire isautomatically relieved of the excessive pressure;

If de's1red;the, valve casing 19 may be provided with a dust ca 37. Thisdust cap may be secured over t e valve mechanism in any suitable manner,one way being to provide for a screw connection 40 with the nipple 15.It is preferable thatthe connection be made so as to provide aninterspace 38 between the;casing 19 and the cap 37 and to provide thecap with openings 39 which are preferably arranged out of alinement withthe apertures 24 in the casing 19. Obviously, theopenings 39 of the capmay be disposed in alinement with the apertures 24 in the casing 19, andthis arrangement is illustrated in Fig. 2 for purpose of conveniencerather than to provide a separate view illustrating the apertures 39disposed out of alinement with the apertures 24. Any dust or dirtfinding its way through the apertures 39 of the cap 37 would lodge inthe interspace 38 between the casing 19 and cap 37.

In referring in this. specification to inner and outer ends of certainelements I mean by the inner end that part disposed toward the axis ofthe wheel on which-thevvalve is or may be used, and by outer end I meanthat end which is adjacent the rim of the wheel on which the valve is ormay be used.

From theforegoing it will be seen that I provide a slmple, inexpensive,durable and efficient safety valve for obviati g blow outs ,incident toexcessivepressure i pneumatic tires.

IVhat is cla'med is In a valve structure of the character described, acasing provided with apertures in its side walls and having a valve seattherein, the inner end of'the valve seat being spaced from the innerwall of the casing to form an annular passage adjacent said apervalveout of the casing through said passage tures, a valve provided with ahollow stem, and said apentures. 10' and a check valve in the hollowstem to pe1= In testimony whereof I afiix my signature mit inflation ofthe-tire through the stem, in presence of two witnesses,

said first-mentioned valve being lifted from SEAMAN P. NOE.

its valve seat under influence of excessive Witnesses:

pressure in the tire and which excessive GEOJB. SMITH,

pressure is forced by said first-mentioned SAMUEL B. Non

